System Including a Hand-Held Communication Device Having a Motion Sensor for Remotely Controlling the Position of a Door of a Land Vehicle and Key Fob for Use in the System

1. A system for remotely controlling the position of a land vehicle door which is capable of moving between a closed position in which the door covers a vehicle opening and an opened position in which the door uncovers the opening to provide access to the opening, the system comprising: a mobile communication device supported on the vehicle for movement therewith; a hand-held communication device including a motion sensor operative to provide motion signals as a function of motions made by a pedestrian carrying the hand-held device; and control logic coupled to the devices, wherein the hand-held and mobile communication devices are capable of wirelessly transmitting and receiving, respectively, command signals as long as the pedestrian carrying the hand-held device is within a first range of the mobile device, each of the command signals containing identification data which identifies the hand-held device and command data which identifies a pedestrian command for the vehicle to automatically perform an operation, the mobile device being operative to remove the identification and command data from the command signals and the control logic being operative to determine if the hand-held device is an authorized hand-held device based on the identification data, and wherein the control logic is operative to detect a sequence of step motions made by the pedestrian carrying an authorized hand-held device when the pedestrian carrying the authorized hand-held device is located within a second range of the mobile device and to generate a door-opening control signal based on the command data when the control logic recognizes the detected sequence of step motions as a door-opening pedestrian command and wherein the second range is less than the first range.

2. The system as claimed in claim 1 , wherein the step motions include walking, standing still and stepping.

3. The system as claimed in claim 1 , wherein the motion sensor comprises an inertial motion sensor.

4. The system as claimed in claim 3 , wherein the inertial motion sensor includes a multi-axis accelerometer to measure linear acceleration.

5. The system as claimed in claim 1 , wherein the hand-held device includes an energy storage device to supply stored electrical energy to the control logic and the motion sensor.

6. The system as claimed in claim 5 , wherein the energy storage device comprises a battery.

7. The system as claimed in claim 1 , wherein the mobile device includes a receiver and wherein the hand-held device includes a transmitter to wirelessly transmit the command signals which are received by the receiver.

8. The system as claimed in claim 7 , wherein the hand-held device includes a user interface coupled to the control logic and wherein the control logic is operative to determine whether the pedestrian has activated the interface to control the transmitter to transmit one of the command signals.

9. The system as claimed in claim 8 , wherein the user interface includes a push button dedicated to opening the vehicle door.

10. The system as claimed in claim 1 , wherein the hand-held device is a key fob.

11. The system as claimed in claim 1 , wherein the mobile device includes a first transceiver and wherein the hand-held device includes a second transceiver that communicates with the first transceiver via two-way communication and wherein the control logic monitors the position of the hand-held device with respect to the mobile device based on data received from the second transceiver.

12. The system as claimed in claim 1 , further comprising a memory for storing reference data which represents a predetermined sequence of step motions, the control logic retrieving the reference data from the memory in order to recognize the predetermined sequence of step motions as the door-opening, pedestrian command.

13. A key fob for use in a remote control system which controls the position of a land vehicle door which is capable of moving between a closed position in which the door covers a vehicle opening and an opened position in which the door uncovers the opening to provide access to the opening, the system having a mobile communication device supported on the vehicle for movement therewith, the key fob comprising: a hand-held communication device including a motion sensor operative to provide motion signals as a function of motions made by a pedestrian carrying the hand-held device; and control logic coupled to the motion sensor, wherein the key fob is capable of wirelessly transmitting command signals as long as the pedestrian carrying the key fob is within a first range of the mobile device, each of the command signals containing identification data which identifies the key fob and command data which identifies a pedestrian command for the vehicle to automatically perform an operation, the mobile device being operative to remove the identification and command data from the command signals and the control logic being operative to determine if the key fob is an authorized key fob based on the identification data, and wherein the control logic is operative to detect a sequence of step motions made by the pedestrian carrying an authorized key fob when the pedestrian carrying the authorized key fob is located within a second range of the mobile device and to generate a door-opening control signal based on the command data when the control logic recognizes the detected sequence of step motions as a door-opening pedestrian command and wherein the second range is less than the first range.

14. The key fob as claimed in claim 13 , wherein the step motions include walking, standing still and stepping.

15. The key fob as claimed in claim 13 , wherein the motion sensor comprises an inertial motion sensor.

16. The key fob as claimed in claim 15 , wherein the inertial motion sensor includes a multi-axis accelerometer to measure linear acceleration.

17. The key fob as claimed in claim 15 , further comprising an energy storage device to supply stored electrical energy to the control logic and the motion sensor.

18. The key fob as claimed in claim 17 , wherein the energy storage device comprises a battery.

19. The key fob as claimed in claim 13 , further comprising a transmitter coupled to the control logic to wirelessly transmit the command signals.

20. The key fob as claimed in claim 19 , further comprising a user interface coupled to the control logic and wherein the control logic is operative to determine whether the pedestrian has activated the interface to control the transmitter to transmit one of the command signals.

21. The key fob as claimed in claim 20 , wherein the user interface includes a push button dedicated to opening the vehicle door.

22. The key fob as claimed in claim 13 , further comprising a transceiver coupled to the control logic to wirelessly transmit the command signals and to wirelessly receive signals.

23. The key fob as claimed in claim 13 , further comprising a memory for storing reference data which represents a predetermined sequence of step motions, the control logic retrieving the reference data from the memory in order to recognize the predetermined sequence of step motions as the door-opening, pedestrian command.